I am sure this has a simple answer

Was tuning up my band saw and adjusting motor pulley, which uses a set
screw. Guess I turned it too tight, rounded off the allen wrench and
now it just turns. It is a metric 3.0 wrench. I also assum the set
screw itself is probably also damaged.

My only solution I see is to eposy the wrnech to the set screw and
then replace both when I get it loose, but don't know if you can buy
individual allen wrenches..

any helpful suggestions?